HF181, HF201 and HF221 Felling Heads Caterpillar

Component Description

Illustration 1	g01729236
(1) Washer for the top pin (2) System of the expander pin (3) Balance frame (4) Cylinder (5) Wear plate (6) Male bearing (7) Female bearing (8) Main gear (9) Nylon strap (10) Hose support (11) Adapter for the boom (12) Gear segment (13) Top pin bushing (14) Top pin (15) Shim

Check Of the Bolts On the Boom Adapter

Illustration 2	g01729377

(16) Bolts ... 700 ± 90 N·m (516 ± 66 lb ft)

Check the torque of the bolts and check the condition of the washer's monthly.

Note: Replace the bolts when the bolts have been removed.

Inspection Of the Main Bearing

Illustration 3	g01729416

1. Check the play of main bearing (17) .

   Minimum recommended play ... 0.127 mm (0.005 inch)

   Maximum recommended play ... 0.318 mm (0.0125 inch)

   Note: If the play of the bearing exceeds the recommended measurement, follow one of the options below:

First Option

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Illustration 4	g01729515

1. Rotate male bearing (19) and female bearing (20) by 90 degrees in the opposite direction. Turn over wear plate (18) by 180 degrees.

Second Option

Illustration 5	g01729653

1. Turn the wear plate over 180 degrees.

2. Measure the external rim for the male bearing at each 90 degree (A) .

3. Machine the external flat surface (B) of the female bearing.

   Note: Respect the following formula:

   Note: Facing = d + 0.005"

Third Option

If you can not eliminate play, replace all components.

Inspection of Gears

Check Of Gear Wear

Illustration 6	g01729834
Play in gear

Illustration 7	g01730013

1. Check the wear of the gears (C) by maintaining the frame in one direction.

   Note: The maximum recommended play in the gears is 3.175 mm (0.125 inch).

Replacement Of a Gear Segment

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Illustration 8	g01730074

1. Remove 4 bolts (21) from gear segment (22). Dislodge gear segment (22) by threading 2 puller bolts (23) into the removal holes.

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Illustration 9	g01730070

2. Torque the bolts in the sequence that is shown in Illustration 9. Torque the bolts three times. Start with the first sequence.

   First sequence ... 203 N·m (150 lb ft)

   Second sequence ... 339 N·m (250 lb ft)

   Third sequence ... 513 N·m (378 lb ft)

Inspection of the Gear On the Adapter

Main Gear Removal

1. Remove the bolts on the adapter of the boom. Dislodge the adapter.

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Illustration 10	g01730456

2. Screw in two puller bolts (24) onto the main gear (25) .

3. Orient main gear (25) by 180 degree's or replace the main gear. As a reference, the puller holes must always be oriented on the top and on the bottom of the main gear.

Inspection Of the Balancing Frame

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Illustration 11	g01730513

1. Check the condition of the holes on the balancing frame. Thoroughly clean the holes.

2. In case of ruptured holes, repair the balancing frame or replace the frame.

Installation Of the Top Pin

Illustration 12	g01730535

1. Align the top pin holes with the pattern for the head bolts. Use the bolts (30) in order to push the top pin into the proper place.

2. Install balancing frame (26) on top pin (27). Press balancing frame (26) against the frame of the felling head.

3. Torque bolts (30) to 454 N·m (335 lb ft).

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Illustration 13	g01730635

4. Add shims (28) between the balancing frame and top washer (29) in order to reduce play.

   Note: Maximum recommended play is 0.762 mm (0.03 inch) (D) .

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Illustration 14	g01730634

5. Torque the bolts in a cross pattern to 339 N·m (250 lb ft). Then, torque the bolts again in a cross pattern to 616 N·m (454 lb ft).

Inspection Of the Cylinders

Check Of the Cylinders

Illustration 15	g01730693

1. Check the condition of wiper seal (31) .

2. Ensure that wiper seal (31) is seated on the seat.

Check Of the Lubrication

Illustration 16	g01731653

1. Ensure that the oil reservoir has proper flow. Recommended oil flow is one drop at every two seconds or one gallon per week.

   Note: Reservoir capacity is 1 gallon.